If you did not drop, bump your camera or put to extreme weather consitions, I would think it is the card. I use Lexar 16Gb 1000x cards but sofar did not have a problem. But, cards can be fragile. Your test should hopefully prove it is only the card. Good luck

memory card issues usually do not affect all images, and not the same way. This could indeed be a camera issue. It could also be a import issue like a damaged connector. Don't import thru a cable on the camera to a computer if you can avoid it, its easy to damage the cable connector, and occasionally the camera connector. Its expensive to fix a camera and card readers are cheap. Card readers can also cause similar issues, but they can be replaced.

If you did not drop, bump your camera or put to extreme weather consitions, I would think it is the card. I use Lexar 16Gb 1000x cards but sofar did not have a problem. But, cards can be fragile. Your test should hopefully prove it is only the card. Good luck

I didn't drop my 5D. will do some cards swapping when I get home today. Still at work.

memory card issues usually do not affect all images, and not the same way. This could indeed be a camera issue. It could also be a import issue like a damaged connector. Don't import thru a cable on the camera to a computer if you can avoid it, its easy to damage the cable connector, and occasionally the camera connector. Its expensive to fix a camera and card readers are cheap. Card readers can also cause similar issues, but they can be replaced.

I removed the CF from camera this morning and used the card reader at work to transfer the images. I used this card reader before and I didn't have any issues.

memory card issues usually do not affect all images, and not the same way. This could indeed be a camera issue. It could also be a import issue like a damaged connector. Don't import thru a cable on the camera to a computer if you can avoid it, its easy to damage the cable connector, and occasionally the camera connector. Its expensive to fix a camera and card readers are cheap. Card readers can also cause similar issues, but they can be replaced.

If I recall correctly...someone has posted similar problem. The conclusion was sensor got damaged due to laser stuff in night club.

Again...I don't recall taking my 5D III to night club or playing with laser stuff around 5D III.